The Centers for Disease Control and Prevention announced Wednesday that the outbreak of E. coli infections linked to romaine lettuce "appears to be over."The CDC said the outbreak appears to be over as of Wednesday, adding the likely source of the outbreak was romaine lettuce harvested from central coastal growing regions of northern and central California.Illnesses occurred from Oct. 7 to Dec. 4, hospitalizing 25 people, according to the CDC. No deaths were reported.But the U.S. Food and Drug Administration is continuing to investigate how the outbreak occurred and the farms involved.Lettuce is vulnerable to illness-causing bacteria such as E. coli because it is generally not cooked before consumption. When produce or other foods are cooked, E. coli can be killed by heat.

WASHINGTON —

The Centers for Disease Control and Prevention announced Wednesday that the outbreak of E. coli infections linked to romaine lettuce "appears to be over."

The CDC said the outbreak appears to be over as of Wednesday, adding the likely source of the outbreak was romaine lettuce harvested from central coastal growing regions of northern and central California.

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Illnesses occurred from Oct. 7 to Dec. 4, hospitalizing 25 people, according to the CDC. No deaths were reported.

But the U.S. Food and Drug Administration is continuing to investigate how the outbreak occurred and the farms involved.

Lettuce is vulnerable to illness-causing bacteria such as E. coli because it is generally not cooked before consumption. When produce or other foods are cooked, E. coli can be killed by heat.